2006 Ventura: Replacing Hydraulic Steering Hoses

Postby jimh » Thu Dec 06, 8:13 am

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Typically in a hydraulic steering system, the helm pump is at the highest point in the system and the engine actuator is at a lower level. The procedure to add fluid is usually done at the helm pump. The helm pump typically has a filler inlet that is normally sealed with a cap. The process of adding fluid during any air bleed procedure is usually done by removing the filler cap, threading into the helm pump filler inlet a new fitting with a hose barb, attaching a hose to the new fitting, and extending the hose vertically upward to a higher level. A reservoir of hydraulic fluid is then attached to the filler hose. The reservoir is vented to the air, and the reservoir level kept high enough that no air will be drawn into the helm pump.

Typically at the engine actuator there will be two air bleed fittings, one on each side, with each associated with one direction of motion of the actuator. The typical air bleed process will open one air bleed, then turn the helm pump in the direction that pushes fluid toward the open air bleed. The air bleed is usually fitted with a temporary hose. The hose outlet is put into a container that will collect the hydraulic fluid. The outlet of the air bleed hose is kept under the level of the fluid collecting in the container. As the helm pump is turned, fluid will begin to be pushed out the bleed outlet, and any air in the system will be expelled along with the fluid, appearing as air bubbles in the outflow. When all air has been expelled from that portion of the system, that air bleed is closed, the bleed for the other direction opened, the temporary hose and container are attached to that air bleed, and the procedure repeated with the helm pump rotating in the other direction.

If there is no indication of a filler port on the helm pump, there may be a completely different procedure necessary to accomplish the addition of fluid and the bleeding of air from the system. If fluid is to be added at a lower point in the system, some sort of filler pump or pressure will be needed to force the fluid into the system, and uphill to the helm pump. There would typically then need to be a bleed air vent at the helm pump to allow the air to escape.

Also, with a Mercury VERADO FOURSTROKE engine, there is likely an electrically-operated steering boost pump involved in the hydraulic steering. The procedure for bleeding the hydraulic system will likely be more complex due to the presence of the electrical boost pump. I suggest you obtain the exact procedure to be used with your exact system from the manufacturer of the system.

It is now common practice that specialized gear is attached to a hydraulic system for the purpose of bleeding air, often called power-bleeding pumps. This gear is able to reduce the amount of wasted fluid expelled from the system during the bleed process. The use of power-bleeding gear also significantly reduces the time involved in bleeding air. And the outcome is usually excellent, that is, all air is quickly and effectively removed from the system in a matter of a few minutes.

ASIDE: I have no recollection that there is any information on continuousWave that provides a detailed description of a Mercury VERADO FOURSTROKE power steering system air bleed procedure. Advice that simply suggests that an answer exists and should be discovered in a search, is advice that has little value. If information does exists that provides good advice on a topic, then please find that information and give the URL to that information.

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